你调用的对象是空的.用于图像.源到wpf中的byte [] [英] Object reference not set to an instance of an object. for image.Source to byte[] in wpf

问题描述

我的将image.source转换为byte []的代码

my code for convert image.source to byte[]

public Byte[] BufferFromImage(BitmapImage imageSource)
{
    Stream stream = imageSource.StreamSource;
    Byte[] buffer = null;
    if (stream != null && stream.Length > 0)
    {
        using (BinaryReader br = new BinaryReader(stream))
        {
            buffer = br.ReadBytes((Int32)stream.Length);
        }
    }

    return buffer;
}

致电:

call :

var s = BufferFromImage(image1.Source as BitmapImage);

如何在wpf中将image1.Source转换为byte []?

how to convert image1.Source to byte[] in wpf ?

推荐答案

只需使用调试器进行验证:

Just use the debugger to verify:

image1 != null
image1.Source != null
image1.Source is BitmapImage

或添加

System.Diagnostics.Debug.Assert(image1 != null, "image1 is null");
System.Diagnostics.Debug.Assert(image1.Source != null, 
                                "image1.Source is null");
System.Diagnostics.Debug.Assert(image1.Source is BitmapImage, 
                                "image1.Source is NOT a BitmapImage");

就在调用BufferFromImage之前.
然后，您应该知道问题出在哪里以及如何解决.

right before the call to BufferFromImage.
Then you should know what is wrong and how to fix it.

如果遇到对象引用错误，并且该错误发生在image1.Source上，则可能是image1 == null.

If you are getting an Object Reference error, and the error is occuring on image1.Source, then likely image1 == null.

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